Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2004-06-03
2010-12-14
Dinh, Duc Q (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S076000, C345S204000, C345S690000
Reexamination Certificate
active
07852330
ABSTRACT:
A semiconductor device is provided in which a transistor which supplies a current to a load (an EL pixel and a signal line) can supply an accurate current without being affected by a variation. A voltage of each terminal of a transistor is controlled by using a feedback circuit using an amplifier circuit. A current Idata is inputted from a current source circuit to a transistor and a gate-source voltage (a source potential) required for the transistor to flow the current Idata is set by using the feedback circuit. The feedback circuit is controlled to operate so that a drain potential of the transistor becomes a predetermined potential. Then, a gate voltage required to flow the current Idata is set. By using the set transistor, an accurate current can be supplied to the load (an EL element and a signal line). As a drain potential can be controlled, the kink effect can be reduced.
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Dinh Duc Q
Fish & Richardson P.C.
Semiconductor Energy Laboratory Co,. Ltd.
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